Patent GB-463147-A (GB)
Title: Improvements relating to liquid dispensing apparatus
IPC: B67D7/16
Filed: 1936-02-07
Abstract: 463,147. Dispensing petrol &c. GILBERT & BARKER MANFG. CO. Feb. 7, 1936, No. 3760. Convention date, Feb. 23, 1935. [Class 116] Apparatus of flow-meter type for dispensing liquid fuel &c. has a motor 2 driving a pump 1 which draws liquid through a pipe 3 and delivers it by way of a pipe 5, air and vapour separator 6, and meter 4, to a sight-flow indicator 9 and hose 8 with delivery nozzle 10. The motor switch 2<1> is closed by a manually-controlled lever after a locking mechanism for the lever has been released by zeroizing the indicators and continuing the motion of the resetting means after zeroizing. The switch is opened to stop the pump either manually or by an automatic mechanism which operates when a predetermined maximum quantity of liquid has been delivered. The fractions indicator 27, Fig. 5, is mounted on a shaft 32 which is frictionally driven by a sleeve coupled by spiral gearing 40, 41 to the meter-driven shaft 37. The units indicator 26 is mounted on a sleeve 36 geared to a shaft 31 which is frictionally driven by a sleeve coupled to the meter-driven shaft 37 by worm gearing 42, 43. The sleeves are frictionally held, to prevent over-running of the indicators, by straps 51, the pressure of which is regulated by a screw-and-nut gear 52,53. Zeroizing-mechanism. The indicators are zeroized by rotation of a knob 79, Fig. 13, which turns a shaft 65 on which is mounted a bevel gear 64, Fig. 5, meshing with a wheel 63 which is loose on the shaft 32 but which drives a cam 69 fast on the shaft 32, in one direction only, through a pawl 68. The shaft 32 carries a cam 56, which, on zeroizing movement of the shaft 32, engages a pawl mounted on a disc 55 free on the shaft 32, the disc 55 being coupled by a sleeve 32<1> with the sleeve 36. Thus both indicators are zeroized, a pawl 58 arresting the disc 55 in the zero position. Starting - lever locking mechanism. The motor switch is actuated by a rod 130, Fig. 13, pivoted to a lever 128 whose movements are controlled by a cam-shaft 88 coupled by bevel gearing to a shaft which is rocked by a handlever. The lever 128 is pivoted at 129' to a bell-crank lever 126 positively rocked in both directions about a fixed pivot 127 by a cam 124, and the free end of the lever 128 is held in alignment with, but quite separate from the pivot 127 by a latch 133 under the control of a rod 155 governed by a stop 159, Fig. 17, on a maximum quantity determining disc 142 which is driven through a clutch by a shaft 77 coupled through spiral-and-spur gearing 72, 70, Fig. 5, to the meter driven shaft 37. The rocking of the cam 124 by the hand-control lever, actuates the lever 128 and bell-crank 126 as a unit to close the switch to start the motor, but when the rod 155 is lifted at the end of the delivery of a predetermined maximum quantity of liquid, the latch is tripped and the lever 128 swings clockwise about the pivot 129 to open the switch and stop the motor. The release of the cam-shaft, and hence of the starting-lever, to initiate delivery is effected by continued rotation of the re-setting knob 79, Fig. 13, after the pointers have been zeroized, such continued rotation causing a cam 99 on the knob to advance a collar 102, thereby rocking a bell-crank lever 107 and lifting a stop 109 clear of a lever 110 whose lower end carries a roller 1101 engaging a cam 114 having three concentric steps 113, 114, 115 of progressively increasing radii. The lifting of the stop 109 by the resetting knob, allows a spring-pressed latch 120 to rotate clockwise under the lug 109 and to support it while the camshaft is rotated by the hand lever to start the motor. A pin 121 on the lever 110 trips the latch from under the stop 109 so that on the return movement of the starting handle the stop 109 descends on to a portion 122 of the lever 110 and so prevents more than a limited angular movement of the lever 110 insufficient to re-start the pump, without first zeroizing the pointers. The transmission between the zeroizing knob 79 and the indicators is interrupted after zeroizing and prior to actuation of the pump by a fork 123 on the lever 110, this fork actuating a sleeve 95 when the roller 1101 passes on to the second cam step 114 as a result of the rotation of the cam-shaft, in order to slide the shaft 65 axially and thus disengage the gear 64, Fig. 5, from the gear 63. Limiting mechanism for delivery of a predetermined maximum quantity. The shaft 77 driven by the meter-driven shaft 37 drives a disc 142, Fig. 10, against the resistance of a clock-spring 149 anchored to a fixed but adjustable barrel 145, by means of a friction clutch 140, 141 which is normally engaged but which may be disengaged by a lever 166, Fig. 17. The disc 142 carries a pin 159 which actuates the latch-tripping gear 155 after predetermined angular movement of the shaft 77, the quantity delivered being determined by the angular setting of the barrel 145, Fig. 10, effected by the insertion of the pin 146 in a selected one of a number of circularly positioned holes 147. The tripping of the latch 133 and consequent stoppage of the motor results in the rotation about the cam-shaft 88 of a bell-crank lever 161, Fig. 17, carrying a cam 165, by means of a spring 162, the cam 165 thereby operating the lever 166 to disengage the clutch 140, 141 thus allowing the disc 142 to return under the influence of the clock-spring 149 to initial position. A similar quantity of liquid may be delivered without resetting the indicators by means of a plunger 81 which actuates the bellcrank lever 161 to allow the clutch 140, 141 to re-engage and, at the same time, returns the lever 128 to switch-closing position to start the pump by a link 160, the gear being held in this position by the latch 133. A cam 168 fast on the cam-shaft 88 is adapted to actuate the lever 166 to disengage the clutch 140, 141 in case the pump is stopped by movement of the hand-lever before the delivery of the predetermined maximum quantity, the cam being so designed that the clutch is disengaged after the opening of the starting switch and reengaged before the closing of the switch. The hose nozzle is adapted to be padlocked to its support and when so secured prevents opening of the nozzle valve and also prevents any substantial movement of the starting handlever.